Leonhard Euler · 1748 · Internet Archive
Introductio in analysin infinitorum
All 320 leaves · leaf 115
Transcription
AC LOGARITHM. TER SERIES EXPLICAT. 87
i fit numerus omni assignabili major, Fractio quoque $\frac{i-1}{i}$ CAP. VII.
ipsam unitatem adæquabit. Ob similem autem rationem erit
$\frac{i-2}{i} = 1$; $\frac{i-3}{i} = 1$; & ita porro; hinc sequitur fore
$\frac{i-1}{2i} = \frac{1}{2}$; $\frac{i-2}{3i} = \frac{1}{3}$; $\frac{i-3}{4i} = \frac{1}{4}$; & ita porro. His
igitur valoribus substitutis, erit $a^z = 1 + \frac{kz}{1} + \frac{k^2 z^2}{1 \cdot 2} + \frac{k^3 z^3}{1 \cdot 2 \cdot 3} +$
$\frac{k^4 z^4}{1 \cdot 2 \cdot 3 \cdot 4} + \&c.$ in infinitum. Hæc autem æquatio simul re-
lationem inter numeros $a$ & $k$ ostendit, posito enim $z=1$,
erit $a = 1 + \frac{k}{1} + \frac{k^2}{1 \cdot 2} + \frac{k^3}{
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